Copyright Law of the United States (Title 17) The text of Title 17 of the United States Code, including all amendments enacted by Congress through December 27, 2020.
In the United States, the idea for Copyright was embedded in the U.S. Constitution in Article 1, Section 8, which describes the powers of Congress.
"Congress shall have Power...To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries"
According to U.S. Copyright Law, copyright protects works of "original authorship that are fixed in a tangible expression". This includes broad categories of literary works, musical works, dramatic works, visual (pictorial, graphic, and sculptural) works, pantomime and choreographical works, motion pictures and other audiovisual works, sound recordings, and architectural works. Copyright takes effect immediately once a work has been fixed in a tangible form - registration is not necessary - and lasts for 70 years after the death of the author, or, in the case of works for hire or anonymous/pseudonymous works, 95 years from publication or 120 years from creation, whichever is shorter.
Copyright gives the author the following exclusive rights:
These rights can be transferred from the author in whole or in parts, but exclusive rights can only be transferred in writing and signed by the copyright holder.
From Copyright Basics (PDF), U.S. Copyright Office Circular 1
General IP: Intellectual Property (IP) is the catch-all term for non-physical but identifiable property. Think of the text of a book: it can be presented in various languages, or different physical forms, but the underlying content remains the same. This underlying content is the intellectual property. In the USA, there are 3 main designations for IP protection that individuals can utilize, these are: Copyright, Trademark and Patent.
Trademarks v Patents v Copyright: Trademarks, Patents & Copyrights all cover different types of IP, and have different goals.
For an all-inclusive example, let’s imagine a bottle of Coca-Cola. The Coca-Cola Corp owns the trademark to the name Coca-Cola, as well as the trademark on the bottle shape, and the graphic representation of their name. These are all things that help distinguish them from other cola brands and define their individual product. Coca-Cola also owns the patent on their formula. This means that no other corporation is allowed to make their cola in quite the same way Coca-Cola makes theirs. Coca-Cola also owns the copyright on their ads and jingles, and the creative copy on their bottles. Unless your use meets a Fair Use standard, you are not allowed to use their copy without receiving their permission!
Goals of Copyright: The stated goal of US copyright law is to promote progress by securing time-limited exclusive rights for creators. (paraphrased from Article 1, Section 8, Clause 8 of the US Constitution)
Exclusive Rights of Creators: Right now, in the USA, Copyright is automatic for content in a fixed form. If you write a book or draw a picture, those things are under copyright, and you are entitled to six exclusive rights about them:
You are not required to register your copyright with the Copyright Office. You are not required to include a copyright statement. If you anticipate that your work will be a high-value project, or that there may be a copyright dispute in the future, you can register with the Copyright Office.
There are limitations on these exclusive rights, the most common of which are Fair Use and Reproduction by Libraries and Archives (for an exhaustive list, see: US Code, Title 17, Chapter 1, Section 107-112.
Things that cannot be copyrighted: Facts cannot be copyrighted, which means that things like basic math, recipes, alphabets, grammatical tropes (eg: “I before e, except after c”) and recipes (the list of ingredients and steps themselves) cannot be copyrighted.
On the other side, ideas cannot be copyrighted either. Only creative media in a fixed form is eligible for copyright.
Most of the information on these copyright pages are reused from Cornell University. https://guides.library.cornell.edu/copyright/copyright-101

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